#!/bin/bash
# -*- coding: utf-8 -*-
# Copyright (C) 2010 Jan Malakhovski

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

mark_sed() {
    sed -n '
s|  *| |g
s|^ \(.*\)$|\1|
s|^\(.*\) $|\1|
p
'
}

input="/dev/stdin"
output="/dev/stdout"

while getopts ":i:o:" opt; do
    case $opt in
    i)
        input="$OPTARG";
        ;;
    o)
        output="$OPTARG";
        ;;
    \?)
        echo "Invalid option: -$OPTARG" >&2
        exit 1
        ;;
  esac
done

cat "$input" | mark_sed > "$output"
